I'd be tempted to try lower pressure in your current tyre, or a different larger tyre as OB suggests.

Upping to 700c rims could give issues with brake alignment (or do you have discs?) and clearance with the frame - I'm not familiar with the TW bent but you could wind up with needing a smaller tyre to make it fit!

I used to run Continental 26" Sport Contacts 44mm at 40 - 50 psi. Worked for me.

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